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范杰林

（ 新疆维吾尔自治区交通运输综合行政执法局 ，新疆 乌鲁木齐 830000)

摘   要 ：为研究矿物掺合料改良预应力孔道压浆材料的力学性能，室内利用粉煤灰矿物掺合料制备了新型 孔道压浆( FADG)材料，对不同养护龄期的FADG 砂浆材料开展流动度、单轴压缩强度 、抗折强度 、膨胀性和泌水性试验，并基于微观电镜扫描从微观结构角度展开研究 。结果表明 ：粉煤灰矿物掺合料能够加强普通水泥 孔道压浆材料的流动性，但对孔道压浆材料的早期抗压强度和抗折强度有着非常明显的劣化效应；养护龄期为 28 d 的抗压强度和抗折强度均呈现出先升高后降低的变化趋势 ；新型 FADG 材料中粉煤灰的最优配比为 20% , 此时其初始流动度为13 . 25 s ,  抗压强度和抗折强度分别为 78. 88 MPa 和 12. 92 MPa ,  无泌水和倒缩现象，养护成型材料的内部结构致密 ，综合工程性能最佳。

关键词 ：粉煤灰 ；孔道压浆材料 ；力学性能 ；流动度 ；膨胀率 ；微观电镜扫描

中图分类号 ：TU528           

文献标志码 ：A            

文章编号 ：1005- 8249  (2023)   04- 0080- 05

DOI : 10. 19860/j . cnki. issn1005- 8249. 2023 . 04. 014

FAN Jielin

（Xinjiang Comprehensive Administrative Law Enforcement Bureau of Transportation ,   Urumqi 830000 ,  China  ) 

Abstract: To study the mechanical properties of mineral admixture to improve the pressure drop material of prestressed duct, a new type of duct grouting (FADG) material was prepared by using fly ash mineral admixture indoors. The fluidity test, uniaxial compression strength test, flexural strength test, expansion test and bleeding test of f FADG mortar materials with different curing ages were carried out, and the research was performed from the perspective of micro mechanism by micro electron microscope scanning test. It is found that: (1) fly ash mineral admixture can strengthen the fluidity of ordinary cement pore grouting materials. However, it has a very obvious deterioration effect on the early compressive strength and flexural strength of pore grouting materials. When the curing age was 28 days, the compressive strength and flexural strength increased first and sunsequently decreased; (2) The optimum proportion of fly ash in the new FADG material is 20%. At this time, its initial fluidity is 13.25 s, and its compressive strength and flexural strength are 78.88 MPa and 12.92 MPa respectively. At the same time, it will not produce bleeding and shrinkage. The internal structure of the curing molding material is dense and the comprehensive engineering performance is the best.

Keywords: fly ash, duct grouting material, mechanical properties, fluidity, expansion rate, microscopic scanning electron microscope

作者简介 ：范志林  ( 1989—) ,   男 ，本科 ， 工程师 ，研究方 向 ：公路工程。

收稿日期 ：2022- 03-27